By using Troid VPN 2.6.9 Trick For unblocked Airtel sims by you will be able to use all your applications including whatsapp, hike,viber, uc mini etc.free of cost without any kind of internet data or balance. This trick is simple to use just follow the procedure carefully. Your android versionshould be 4.0+.
NOTE:-If this trick worked in your device then your sim is not blocked otherwise it may be blocked/ double blocked
Note: Please activate airtel internet setting.
1) Download Troid VPN 2.6.9 from Here